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Our 8 year old LOVES the Mighty Robot series! Our only problem is the binding- the books tend to fall apart, a page slips out...then another...then you have a frustrated 8 year old. We have the entire series and it has happened with nearly every book. BUT, we LOVE the stories!
This chapter book series are just right for beginning readers. The hero robot who fights creative looking villains appeals to young boys. I did not think the fighting pictures were violent. My son loved it and will soon be moving up to the "Captain Underpants" series from the same author.
The book is great, just not at all long enough or challenging enough for most 7-8 year olds. My son just turned 8 and blew through this book so fast it wasn't worth buying. Would suggest for 6 and under only.